stream.eof exception

Hello,

I'm working with the JDBC driver from the Postgresql 7.0 distribution.
The encoding of my database is Unicode.

I have a very long transaction comprising 50000 updates oparations. 
Specifically 'insert into table' and 'create table'operations are made. 

The problem is that after passing some time a
postgresql.stream.eofexception is throwed. I can't understand what causes
this exception. 

Thank you in advance for your help
Sofia Alexaki